83-2 OP-AMP --resistor circuits N 0→U2=bc 0 0 R B R i=0 i=0 N P 0 Dr=0.UA=UB D=A(U4-UB)=cons tant The inverting OP-AMP circuit. R2 KCL R RI R2 ●● 0 and i=0 R 0 01 R, R2 R§3-2 OP-AMP --resistor circuits Ri =  i N = 0 i P = 0 A cons t x A B c A B  = 0  =  = ( − ) = tan Ro = 0 →2 = C    = = →  → = → − + 0 0 0 i i R i i The inverting OP-AMPcircuit. i R R KCL x x = − + − 2 2 1 1 :      x = 0 and i = 0 1 2 1 2 2 2 1 1 0 R R or R R + = = −      A  B −  2 = +  x 0 N i P i  + + −  x R2 − +  2 − +  1 R1 i  + + −